Plug valve



' PLUG VALVE F. A. BROWNE Original Filed Feb. 17. 1930 Dec. 8, 1936.

Reissued Dec. 8; 1936.

PLUG VALVE Frank A. Browne, Wayne, Pa, assignor, by means assignments,of one-half to Walworth Patents,

Inc, Boston, Man, a corporation of Massachusetls, and mini! to MerooNordstrom Valve Company, Pittsburgh, Pa, a corporation Delaware OriginalNo. 1,922,840, dated AW 15. 1933- Serial No. 429,048,

17, 1930. Appli- February cation for reillle March 11, 1985, Serial No.

a yielding pressure on the plug to urge it toward,

its narrow end relative to the casing. when 10 such devices are used invalves arranged to handle hot material they serve to allow for the rapidexpansion of the plug as compared with the slower expansion of the valvebody, when, for.

example, the hot material is turned through the valve prior to theheating of the casing by means of steam it the valve is of the jacketedtype. The springs, however, are subjected to such considerable ranges oftemperature that they lose their temper and hence become ineflective, Itis accordingly the object of the'present invention to provide meanswhereby the plug is maintained seated irrespective oi. extremeconditions of temperature of the various parts of the valve, the meansprovided being unaflected by repeated changes of temperature.

More specific objects of the invention will be apparent from thefollowing description read in conjunction with the accompanying drawing,in which there is illustrated a vertical section through a valveembodying one modification of the invention. The valve comprises acasing normed withla tapered seat 4 in which the tapered plug 6 isrotatably supported, the plug in the present instance belfig hollow andprovided with suitable portslarrangedtoalignwithpassagesinthe casing inthe usual manner. While thevalve illustrated is of the ordinary type, itmay be of a jacketed type so that materials which are semisolid atordinary temperatures may be maintained in mobile condition. The smallerend of the plug is provided with a squared stem I! which may be engagedby a wrench in the operation of t valve At the larger end of the plugthere is provided an adjustable bearing screw ll the end of whichengages a central boss on the end of the plug and which is threadedthrough a boss ll of steel welded in a central opening in a circularplate component of lubricant pressure in the grooves. 25

1 Claim. (cl. 251-112 It, the periphery oi! which is bolted to thecaslng with the interposition of a gasket 20 to render the connectionfluid tight. The closure plate It,

qwhich is oi'steel, is made of such thickness as to give the necessarydegree of resilience with- 5 out being strained beyond its elastic limitby the maximum change in temperature in the-valve. The screw I4 is keptjust tight enough to maintain the plug in seated position-when the valveis cold. It is fixed in its adjusted position by a 10 lock nut 22 whichis tightened down against a gasket. 23 interposed between it and theseat It. Thisprevents leakage in the threads. It will be noted that theentire arrangement provides a complete closure for the end of thecasing. 15

The smaller end of the plug is packed as indicated at 2|, a gland 26being bolted to the casing to compress this packing. Lubrication iseffected through the medium of a screw 28 which forces lubricant underpressure from a suitable chamber 20 into the lubricant distributinggrooves lll'formed either in the plug, as shown, or in the seat, and theplug is jacked slightly 011' its seat against the resilient seatingpressure of the cover by the axial By the above arrangement, it will beseen that uneven expansion such as would occur upon theturningothotmaterialthroughthevalvebeiore steam had been turned into thejacket is taken care of by the resilience 01' plate It which will somaintain the plug seated under all conditions. The extreme condition isas just stated, at which time rapid n of the plug due to the increase intemperature will occur, as compared with the rather slower expansion ofthe valve 35 body, which is heated only by conduction from I the Plug.

be applied to various other types of valves as, 45

for example, gate valves, wherein the bonnet which forms a closure forthe casing andcontacts with and acts to support the movable valvememher, or gate, may be made flexible. Thus it will be understood that Icontemplate my invention 5

